[US-342] Update go.mod go version, unipdf version and add writer to modify contents

.github/workflows/go.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [ '1.20', '1.19', '1.18', '1.17' ]
+        go: [ '1.22', '1.21', '1.20', '1.19', '1.18' ]
     steps:
     - name: Check out code into the Go module directory
       uses: actions/checkout@v2

go.mod

@@ -1,6 +1,6 @@
 module github.com/unidoc/unidoc-examples
 
-go 1.17
+go 1.18
 
 require (
 	cloud.google.com/go/kms v1.10.1
@@ -12,10 +12,10 @@ require (
 	github.com/unidoc/globalsign-dss v0.0.0-20220330092912-b69d85b63736
 	github.com/unidoc/pkcs7 v0.2.0
 	github.com/unidoc/unichart v0.3.0
-	github.com/unidoc/unipdf/v3 v3.54.0
+	github.com/unidoc/unipdf/v3 v3.55.0
 	github.com/wcharczuk/go-chart/v2 v2.1.0
-	golang.org/x/crypto v0.17.0
-	golang.org/x/image v0.14.0
+	golang.org/x/crypto v0.21.0
+	golang.org/x/image v0.15.0
 	golang.org/x/text v0.14.0
 	google.golang.org/api v0.114.0
 	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1
@@ -27,9 +27,9 @@ require (
 	cloud.google.com/go/compute v1.19.1 // indirect
 	cloud.google.com/go/compute/metadata v0.2.3 // indirect
 	cloud.google.com/go/iam v0.13.0 // indirect
-	github.com/adrg/strutil v0.2.3 // indirect
+	github.com/adrg/strutil v0.3.1 // indirect
 	github.com/adrg/sysfont v0.1.2 // indirect
-	github.com/adrg/xdg v0.3.3 // indirect
+	github.com/adrg/xdg v0.4.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
@@ -43,18 +43,18 @@ require (
 	github.com/miekg/pkcs11 v1.0.3 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/sirupsen/logrus v1.8.1 // indirect
-	github.com/stretchr/testify v1.8.4 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
+	github.com/stretchr/testify v1.9.0 // indirect
 	github.com/thales-e-security/pool v0.0.2 // indirect
 	github.com/unidoc/freetype v0.2.3 // indirect
 	github.com/unidoc/garabic v0.0.0-20220702200334-8c7cb25baa11 // indirect
 	github.com/unidoc/timestamp v0.0.0-20200412005513-91597fd3793a // indirect
-	github.com/unidoc/unitype v0.2.1 // indirect
+	github.com/unidoc/unitype v0.4.0 // indirect
 	go.opencensus.io v0.24.0 // indirect
-	golang.org/x/net v0.17.0 // indirect
+	golang.org/x/net v0.22.0 // indirect
 	golang.org/x/oauth2 v0.7.0 // indirect
-	golang.org/x/sys v0.15.0 // indirect
-	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+	golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/grpc v1.56.3 // indirect
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect

go.sum

@@ -611,13 +611,17 @@ github.com/adrg/strutil v0.1.0/go.mod h1:pXRr2+IyX5AEPAF5icj/EeTaiflPSD2hvGjngui
 github.com/adrg/strutil v0.2.2/go.mod h1:EF2fjOFlGTepljfI+FzgTG13oXthR7ZAil9/aginnNQ=
 github.com/adrg/strutil v0.2.3 h1:WZVn3ItPBovFmP4wMHHVXUr8luRaHrbyIuLlHt32GZQ=
 github.com/adrg/strutil v0.2.3/go.mod h1:+SNxbiH6t+O+5SZqIj5n/9i5yUjR+S3XXVrjEcN2mxg=
+github.com/adrg/strutil v0.3.1 h1:OLvSS7CSJO8lBii4YmBt8jiK9QOtB9CzCzwl4Ic/Fz4=
+github.com/adrg/strutil v0.3.1/go.mod h1:8h90y18QLrs11IBffcGX3NW/GFBXCMcNg4M7H6MspPA=
 github.com/adrg/sysfont v0.1.1/go.mod h1:19nTHzfIn/HbngFMet+yNAvwSQYtOJYMI7vWexLWyNw=
 github.com/adrg/sysfont v0.1.2 h1:MSU3KREM4RhsQ+7QgH7wPEPTgAgBIz0Hw6Nd4u7QgjE=
 github.com/adrg/sysfont v0.1.2/go.mod h1:6d3l7/BSjX9VaeXWJt9fcrftFaD/t7l11xgSywCPZGk=
 github.com/adrg/xdg v0.2.1/go.mod h1:ZuOshBmzV4Ta+s23hdfFZnBsdzmoR3US0d7ErpqSbTQ=
 github.com/adrg/xdg v0.3.0/go.mod h1:7I2hH/IT30IsupOpKZ5ue7/qNi3CoKzD6tL3HwpaRMQ=
 github.com/adrg/xdg v0.3.3 h1:s/tV7MdqQnzB1nKY8aqHvAMD+uCiuEDzVB5HLRY849U=
 github.com/adrg/xdg v0.3.3/go.mod h1:61xAR2VZcggl2St4O9ohF5qCKe08+JDmE4VNzPFQvOQ=
+github.com/adrg/xdg v0.4.0 h1:RzRqFcjH4nE5C6oTAxhBtoE2IRyjBSa62SCbyPidvls=
+github.com/adrg/xdg v0.4.0/go.mod h1:N6ag73EX4wyxeaoeHctc1mas01KZgsj5tYiAIwqJE/E=
 github.com/ajstarks/deck v0.0.0-20200831202436-30c9fc6549a9/go.mod h1:JynElWSGnm/4RlzPXRlREEwqTHAN3T56Bv2ITsFT3gY=
 github.com/ajstarks/deck/generate v0.0.0-20210309230005-c3f852c02e19/go.mod h1:T13YZdzov6OU0A1+RfKZiZN9ca6VeKdBdyDV+BY97Tk=
 github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
@@ -867,6 +871,8 @@ github.com/ruudk/golang-pdf417 v0.0.0-20201230142125-a7e3863a1245/go.mod h1:pQAZ
 github.com/sirupsen/logrus v1.5.0/go.mod h1:+F7Ogzej0PZc/94MaYx/nvG9jOFMD2osvC3s+Squfpo=
 github.com/sirupsen/logrus v1.8.1 h1:dJKuHgqk1NNQlqoA6BTlM1Wf9DOH3NBjQyu0h9+AZZE=
 github.com/sirupsen/logrus v1.8.1/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
+github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
+github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
 github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
 github.com/spf13/afero v1.3.3/go.mod h1:5KUK8ByomD5Ti5Artl0RtHeI5pTF7MIDuXL3yY520V4=
 github.com/spf13/afero v1.6.0/go.mod h1:Ai8FlHk4v/PARR026UzYexafAt9roJ7LcLMAmO6Z93I=
@@ -886,6 +892,8 @@ github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o
 github.com/stretchr/testify v1.8.3/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/thales-e-security/pool v0.0.2 h1:RAPs4q2EbWsTit6tpzuvTFlgFRJ3S8Evf5gtvVDbmPg=
 github.com/thales-e-security/pool v0.0.2/go.mod h1:qtpMm2+thHtqhLzTwgDBj/OuNnMpupY8mv0Phz0gjhU=
 github.com/trimmer-io/go-xmp v1.0.0 h1:zY8bolSga5kOjBAaHS6hrdxLgEoYuT875xTy0QDwZWs=
@@ -906,8 +914,12 @@ github.com/unidoc/unichart v0.3.0 h1:VX1j5yzhjrR3f2flC03Yat6/WF3h7Z+DLEvJLoTGhoc
 github.com/unidoc/unichart v0.3.0/go.mod h1:8JnLNKSOl8yQt1jXewNgYFHhFm5M6/ZiaydncFDpakA=
 github.com/unidoc/unipdf/v3 v3.54.0 h1:e4mhnljZpwGI7xDwcptZUveHMdowF7fF/00GDrPLbIA=
 github.com/unidoc/unipdf/v3 v3.54.0/go.mod h1:xvgaJZ5l/iPpsR/I2LTwNtixL12H9ITRNnZnm6a77iE=
+github.com/unidoc/unipdf/v3 v3.55.0 h1:hPkhl+BCZoRLgk+cOW8mdRZ8SUjOj/8HsSRAOmzw5CE=
+github.com/unidoc/unipdf/v3 v3.55.0/go.mod h1:06Q/thbRvuQSYiRdtpZ4rZjIug7hg1TJpifNMG7PcBU=
 github.com/unidoc/unitype v0.2.1 h1:x0jMn7pB/tNrjEVjy3Ukpxo++HOBQaTCXcTYFA6BH3w=
 github.com/unidoc/unitype v0.2.1/go.mod h1:mafyug7zYmDOusqa7G0dJV45qp4b6TDAN+pHN7ZUIBU=
+github.com/unidoc/unitype v0.4.0 h1:/TMZ3wgwfWWX64mU5x2O9no9UmoBqYCB089LYYqHyQQ=
+github.com/unidoc/unitype v0.4.0/go.mod h1:HV5zuUeqMKA4QgYQq3KDlJY/P96XF90BQB+6czK6LVA=
 github.com/wcharczuk/go-chart/v2 v2.1.0 h1:tY2slqVQ6bN+yHSnDYwZebLQFkphK4WNrVwnt7CJZ2I=
 github.com/wcharczuk/go-chart/v2 v2.1.0/go.mod h1:yx7MvAVNcP/kN9lKXM/NTce4au4DFN99j6i1OwDclNA=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
@@ -944,6 +956,8 @@ golang.org/x/crypto v0.0.0-20220313003712-b769efc7c000/go.mod h1:IxCIyHEi3zRg3s0
 golang.org/x/crypto v0.14.0/go.mod h1:MVFd36DqK4CsrnJYDkBA3VC4m2GkXAM0PvzMCn4JQf4=
 golang.org/x/crypto v0.17.0 h1:r8bRNjWL3GshPW3gkd+RpvzWrZAwPS49OmTGZ/uhM4k=
 golang.org/x/crypto v0.17.0/go.mod h1:gCAAfMLgwOJRpTjQ2zCCt2OcSfYMTeZVSRtQlPC7Nq4=
+golang.org/x/crypto v0.21.0 h1:X31++rzVUdKhX5sWmSOFZxx8UW/ldWx55cbf08iNAMA=
+golang.org/x/crypto v0.21.0/go.mod h1:0BP7YvVV9gBbVKyeTG0Gyn+gZm94bibOW5BjDEYAOMs=
 golang.org/x/exp v0.0.0-20180321215751-8460e604b9de/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20180807140117-3d87b88a115f/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
@@ -975,6 +989,8 @@ golang.org/x/image v0.0.0-20211028202545-6944b10bf410/go.mod h1:023OzeP/+EPmXeap
 golang.org/x/image v0.0.0-20220302094943-723b81ca9867/go.mod h1:023OzeP/+EPmXeapQh35lcL3II3LrY8Ic+EFFKVhULM=
 golang.org/x/image v0.14.0 h1:tNgSxAFe3jC4uYqvZdTr84SZoM1KfwdC9SKIFrLjFn4=
 golang.org/x/image v0.14.0/go.mod h1:HUYqC05R2ZcZ3ejNQsIHQDQiwWM4JBqmm6MKANTp4LE=
+golang.org/x/image v0.15.0 h1:kOELfmgrmJlw4Cdb7g/QGuB3CvDrXbqEIww/pNtNBm8=
+golang.org/x/image v0.15.0/go.mod h1:HUYqC05R2ZcZ3ejNQsIHQDQiwWM4JBqmm6MKANTp4LE=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
 golang.org/x/lint v0.0.0-20190301231843-5614ed5bae6f/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
@@ -1065,6 +1081,8 @@ golang.org/x/net v0.9.0/go.mod h1:d48xBJpPfHeWQsugry2m+kC02ZBRGRgulfHnEXEuWns=
 golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
 golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
+golang.org/x/net v0.22.0 h1:9sGLhx7iRIHEiX0oAJ3MRZMUCElJgy7Br1nO+AMN3Tc=
+golang.org/x/net v0.22.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -1167,6 +1185,7 @@ golang.org/x/sys v0.0.0-20210823070655-63515b42dcdf/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210908233432-aa78b53d3365/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211019181941-9d821ace8654/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211124211545-fe61309f8881/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211210111614-af8b64212486/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -1181,8 +1200,10 @@ golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220610221304-9f5ed59c137d/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220615213510-4f61da869c0c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220624220833-87e55d714810/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220731174439-a90be440212d/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220829200755-d48e67d00261/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -1195,6 +1216,8 @@ golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.15.0 h1:h48lPFYpsTvQJZF4EKyI4aLHaev3CxivZmv7yZig9pc=
 golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.18.0 h1:DBdB3niSjOA/O0blCZBqDefyWNYveAYMNF1Wum0DYQ4=
+golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.2.0/go.mod h1:TVmDHMZPmdnySmBfhjOoOdhjzdE1h4u1VwSiw2l1Nuc=
@@ -1301,6 +1324,8 @@ golang.org/x/xerrors v0.0.0-20220517211312-f3a8303e98df/go.mod h1:K8+ghG5WaK9qNq
 golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
 golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 h1:H2TDz8ibqkAF6YGhCdN3jS9O0/s90v0rJh3X/OLHEUk=
 golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
+golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028 h1:+cNy6SZtPcJQH3LJVLOSmiC7MMxXNOb3PU/VUEz+EhU=
+golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028/go.mod h1:NDW/Ps6MPRej6fsCIbMTohpP40sJ/P/vI1MoTEGwX90=
 gonum.org/v1/gonum v0.0.0-20180816165407-929014505bf4/go.mod h1:Y+Yx5eoAFn32cQvJDxZx5Dpnq+c3wtXuadVZAcxbbBo=
 gonum.org/v1/gonum v0.8.2/go.mod h1:oe/vMfY3deqTw+1EZJhuvEW2iwGF1bW9wwu7XCu0+v0=
 gonum.org/v1/gonum v0.9.3/go.mod h1:TZumC3NeyVQskjXqmyWt4S3bINhy7B4eYwW69EbyX+0=

writer/pdf_modify_contents.go

@@ -0,0 +1,130 @@
+/*
+ * Initiate empty PDF Writer, clean the Annots from pages and show analysis for newly created PDF.
+ *
+ * Run as: go run pdf_modify_contents.go input.pdf output.pdf
+ */
+
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/unidoc/unipdf/v3/common/license"
+	"github.com/unidoc/unipdf/v3/core"
+	"github.com/unidoc/unipdf/v3/model"
+)
+
+func init() {
+	// Make sure to load your metered License API key prior to using the library.
+	// If you need a key, you can sign up and create a free one at https://cloud.unidoc.io
+	err := license.SetMeteredKey(os.Getenv(`UNIDOC_LICENSE_API_KEY`))
+	if err != nil {
+		panic(err)
+	}
+}
+
+type cmdOptions struct {
+	pdfPassword string
+}
+
+func main() {
+	var opt cmdOptions
+	flag.StringVar(&opt.pdfPassword, "password", "", "PDF Password (empty default)")
+	flag.Parse()
+	args := flag.Args()
+	if len(args) < 2 {
+		fmt.Fprintln(os.Stderr, "Syntax: go run main.go [options] input.pdf output.pdf")
+		os.Exit(1)
+	}
+
+	inputPath := args[0]
+	outputPath := args[1]
+	fmt.Printf("Input file: %s\n", inputPath)
+
+	readerOpts := model.NewReaderOpts()
+	readerOpts.Password = opt.pdfPassword
+
+	pdfReader, f, err := model.NewPdfReaderFromFile(inputPath, readerOpts)
+	if err != nil {
+		panic(err)
+	}
+	defer f.Close()
+
+	pdfWriter := model.NewPdfWriter()
+
+	// Removes annotations from each pages.
+	numPages, err := pdfReader.GetNumPages()
+	if err != nil {
+		panic(err)
+	}
+	for i := 0; i < numPages; i++ {
+		page, err := pdfReader.GetPage(i + 1)
+		if err != nil {
+			panic(err)
+		}
+
+		if page.Annots != nil {
+			fmt.Printf("-- Removing Annots on Page %d\n", i+1)
+			page.Annots = nil
+		}
+
+		err = pdfWriter.AddPage(page)
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	outDoc := bytes.NewBuffer(nil)
+	err = pdfWriter.Write(outDoc)
+	if err != nil {
+		panic(err)
+	}
+
+	pdfReader, err = model.NewPdfReader(bytes.NewReader(outDoc.Bytes()))
+	if err != nil {
+		panic(err)
+	}
+
+	err = inspectPdf(pdfReader)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		os.Exit(1)
+	}
+
+	err = os.WriteFile(outputPath, outDoc.Bytes(), 0777)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("Output file: %s\n", outputPath)
+}
+
+func inspectPdf(pdfReader *model.PdfReader) error {
+	objNums := pdfReader.GetObjectNums()
+
+	// Output.
+	fmt.Printf("%d PDF objects:\n", len(objNums))
+	for i, objNum := range objNums {
+		obj, err := pdfReader.GetIndirectObjectByNumber(objNum)
+		if err != nil {
+			return err
+		}
+		fmt.Println("=========================================================")
+		fmt.Printf("%3d: %d 0 %T\n", i, objNum, obj)
+		if stream, is := obj.(*core.PdfObjectStream); is {
+			decoded, err := core.DecodeStream(stream)
+			if err != nil {
+				return err
+			}
+			fmt.Printf("Decoded:\n%s\n", decoded)
+		} else if indObj, is := obj.(*core.PdfIndirectObject); is {
+			fmt.Printf("%T\n", indObj.PdfObject)
+			fmt.Printf("%s\n", indObj.PdfObject.String())
+		}
+	}
+
+	return nil
+}